KS3 Science - Acids & Alkalis

What does the pH scale measure?

• The temperature of a substance

• The strength of an acid or alkali

• The density of a liquid

• The amount of sugar in a solution

Which of the following has a pH greater than 7?

• Lemon juice

• Vinegar

• Soap

• Cola

Which household substance is an acid?

• Baking soda

• Vinegar

• Bleach

• Washing-up liquid

What color does litmus paper turn in an acid?

• Green

• Red

• Blue

• Yellow

What color does universal indicator turn in a strong alkali?

• Red

• Green

• Purple

• Yellow

What is the word equation for the reaction between an acid and an alkali?

• Acid + Alkali → Salt + Water

• Acid + Metal → Salt + Hydrogen

• Acid + Carbonate → Salt + Water + Carbon Dioxide

• Acid + Base → Hydrogen + Water

What is the chemical test for hydrogen gas?

• Relights a glowing splint

• Turns limewater milky

• Produces a squeaky pop with a lit splint

• Changes universal indicator to purple

What is the name of the reaction between an acid and a base?

• Neutralisation

• Combustion

• Precipitation

• Decomposition

What are the products of the reaction between an acid and a carbonate?

• Salt and water

• Salt, water, and carbon dioxide

• Salt and hydrogen

• Salt and oxygen

Which pH value represents a neutral substance?

• 1

• 7

• 10

• 14